39680649 has 6 divisors (see below), whose sum is σ = 57316506. Its totient is φ = 26453760.

The previous prime is 39680639. The next prime is 39680653. The reversal of 39680649 is 94608693.

It can be written as a sum of positive squares in only one way, i.e., 38975049 + 705600 = 6243^2 + 840^2 .

It is not a de Polignac number, because 39680649 - 2⁵ = 39680617 is a prime.

It is a super-2 number, since 2×39680649² = 3149107810122402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (39680609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2204472 + ... + 2204489.

It is an arithmetic number, because the mean of its divisors is an integer number (9552751).

Almost surely, 2^39680649 is an apocalyptic number.

It is an amenable number.

39680649 is a deficient number, since it is larger than the sum of its proper divisors (17635857).

39680649 is a wasteful number, since it uses less digits than its factorization.

39680649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4408967 (or 4408964 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 45.

The square root of 39680649 is about 6299.2578134253. The cubic root of 39680649 is about 341.0826188760.

It can be divided in two parts, 3968064 and 9, that multiplied together give a square (35712576 = 5976²).

The spelling of 39680649 in words is "thirty-nine million, six hundred eighty thousand, six hundred forty-nine".